Adsorption capacity was studied having seaweed Undaria pinnatifida sp. in adsorption of metal ions of zinc and cadmium to an individual system (monometallic) and mixtures (bimetal) of an aqueous solution. We studied this process preliminarily, contact time, pH of the biopolymer solution and treatment. The kinetic study of the behavior determined that the adsorption system was pseudo second-order equation using the Langergren (initial concentration 50mg/L, weight = 0,4g biopolymer, pH = 3 - 5). The nonlinear modeling the Langmuir and Freundlich isotherm, the Langmuir model obtained a better correlation coefficient close to unity, determining the maximum sorption capacity of metals such as zinc ions was qmax = 44,91mg/g and cadmium qmax = 102,38 mg/g at pH = 4 at a contact time of 60 minutes, with the alga in untreated monometallic system, being more efficient for the ion adsorption cadmiu...

Adsorption capacity was studied having seaweed Undaria pinnatifida sp. in adsorption of metal ions of zinc and cadmium to an individual system (monometallic) and mixtures (bimetal) of an aqueous solution. We studied this process preliminarily, contact time, pH of the biopolymer solution and treatment. The kinetic study of the behavior determined that the adsorption system was pseudo second-order equation using the Langergren (initial concentration 50mg/L, weight = 0,4g biopolymer, pH = 3 - 5). The nonlinear modeling the Langmuir and Freundlich isotherm, the Langmuir model obtained a better correlation coefficient close to unity, determining the maximum sorption capacity of metals such as zinc ions was qmax = 44,91mg/g and cadmium qmax = 102,38 mg/g at pH = 4 at a contact time of 60 minutes, with the alga in untreated monometallic system, being more efficient for the ion adsorption cadmiu...

Pectin is a mixture of polysaccharides containing galacturonic acid units, as main compound, into its structure and it is found by forming a part of the vegetables cell wall, such as citrus. Carboxylic groups in their anionic form are characterized for their binding capacity for cationic species such as Pb2+. Orange peels were used as a source of pectin, through acid hydrolysis (pH=1.4, temperature: 80°C, time: 60 min.). For decreasing the hydration and swelling capacity when pectin is found in aqueous solution medium, crosslinked by using formaldehyde was made. Maximum sorption capacity was obtained at pH between 4.5 and 5.5. The most of the cases Pseudo first arder mathematic kinetic model fit it better than Pseudo second arder to kinetic biosorption of lead in pectin for either difierent initial metal concentrations in solution or difierent amounts of biosorbent.

La pectina es una mezcla de polisacáridos que presentan principalmente unidades de ácido galacturónico en su estructura y se encuentra formando parte de la pared celular de vegetales como los cítricos. Los grupos carboxílicos en su forma anionica se caracterizan por tener tendencia hacia la captación de especies catiónicas como Pb2+. La fuente empleada para la obtención de pectina, mediante hidrólisis ácida (pH = 1.4, temperatura: 80°C tiempo: 60 min.) fueron las cáscaras de naranja. Para disminuir la capacidad de hidratación e hinchamiento de la pectina cuando se encuentra en medio acuoso se realizó la reticulación empleando formaldehído. El rango de pH en el cual se obtuvo la máxima capacidad de sorción fue 4.5 - 5.5. En la mayoría de los casos el modelo matemático de cinética de Pseudo primer orden se ajustó mejor que Pseudo segundo orden a la cinética de biosor...